docs: def formal_cities(reverse=False):
    """
    Get a dictionary that maps all Backpage city names to their presentable, formal names.
  
    Returns:
      dictionary of Backpage city names mapped to formal city names
    """
    output = {}
    fname = pkg_resources.resource_filename(__name__, 'resources/Formal_City_Name_Pairs.csv')
    with open(fname, 'rU') as csvfile:
      reader = csv.reader(csvfile, delimiter = ',')
      for row in reader:
        if not reverse:
          # Informal to formal
          output[row[0]] = row[1]
        else:
          # Formal to informal
          output[row[1]] = row[0]
    return output